Android may be created by an advertising company but they also give you the ability to run whatever OS you want and strip it of Google’s proprietary software completely. These days you can install OS like Graphene by simply plugging in your phone and clicking buttons in your browser.

That’s like saying since computers come with Windows pre-installed, Microsoft gave you the ability to install Linux. Computers are agnostic to what runs on them, they’re inherently neutral unless made on the deeper level to prohibit side loading. Like a lot of Androids and all iPhones do.